corrupted downloads

For some reason i have a problem downloading any type of executable file.  Whenever i try to extract the file or run setup, i get error messages such as I/O errors, corrupted download errors, missing .dll's, as well as some others.  This problem has been consistent since i first put this computer together. I've formatted and reloaded windows on two seperate hard drives but that didn't solve the issue.  I thought it might be my nic card, so i changed it out and that isn't the issue.  What could cause all my downloads to be corrupt from all different types of programs, such as zone alarm, firefox, flash player, dvdshrink, and anything else you can think of? Any help would be appreciated

Here's my system specs:
2 GB Corsair pc4000
AMD athlon 64 3400
2 PNY NVidia 6800 Ultra's
2 250 GB Maxtor HD's
Windows XP Pro. Service Pack 2 and fully updated
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Irwin SantosComputer Integration SpecialistCommented:
let's test for malware
Download and Install.

Copy and paste your log to:

Look for NASTIES and post your results here
Download Ewido,, install, open program, check for updates, restart computer, press F8 before windows logo appears, select safe mode, open Ewido, run full system scan. let Ewido delete all it finds, if anything is called serious by Ewido, disable Norton's Goback, and run Ewido again.

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thelonesquirrelAuthor Commented:
everything was safe through hijack this except for this one unknown
O4 - HKLM\..\Run: [NvMediaCenter] RunDLL32.exe NvMCTray.dll,NvTaskbarInit
Irwin SantosComputer Integration SpecialistCommented:
ok.. now run Ewido
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you might have problems with PCI settings (bios): set them to off: PCI master read caching, Delayed transaction, PCI to DRAM prefetch, Byte merge

You may also have a hd drive problem :

try using the free diagnostic utility from the vendor of your disk to check for problems with the HD:

Are you using a router?  Are you able to connect directly to your modem and see if they are still corrupted when downloaded?
thelonesquirrelAuthor Commented:
ewido did the job.  It deleted the malware and now i can download fine. thanks a lot
Irwin SantosComputer Integration SpecialistCommented:
cool. thank yoU!
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